def Derivativef():
    import tkinter as tk
    linearwindow6=tk.Tk()
    linearwindow6.title("Derivativef")
    linearwindow6.geometry("600x700")
    
    def derf():
        yfs=[]
        yfs=eval(e3.get())
        lee=len(yfs)
#       print(lee)
        j=0
        coo=0
        i=0
        for i in range(lee):
            if yfs[i][1]!=0 and coo==0 and yfs[i][0]!=0:
                tx.insert('insert',"dy/dx=\n({0}*x^{1})".format(yfs[i][0]*yfs[i][1],yfs[i][1]-1))
                coo=coo+1
            elif yfs[i][1]!=0 and yfs[i][0]!=0:
                tx.insert('insert',"+({0}*x^{1})".format(yfs[i][0]*yfs[i][1],yfs[i][1]-1))
                coo=coo+1
        if coo==0:
            tx.insert('insert',"0")
        tx.insert('insert','\n\n')  

    lb1=tk.Label(linearwindow6, text='在[]从高到低输入系数和指数，\n以逗号分隔每一项,里examp:[[a5,5],[a3,3]]', bg='orange', font=('Arial', 12), width=37, height=2)
    lb1.pack()
    e3 = tk.Entry(linearwindow6,font=('Arial', 14),width=25)
    e3.pack()
    bt3=tk.Button(linearwindow6,text='生成导函数',width=17,height=2,font=('Arial', 12),command=derf)
    bt3.pack()

    tx=tk.Text(linearwindow6,width=39,height=30)
    tx.pack()
    linearwindow6.mainloop()